METHOD AND SYSTEM FOR CONTROLLING POLLUTANT EMISSIONS IN COMBUSTION OPERATIONS

摘要

The present invention relates to methods and systems for reducing pollutant emissions associated with combustion operations, e.g. cement manufacturing. The invention further relates to the disposal of sludge, e.g., produced by waste water treatment plants, by introducing it into the combustion process. In particular, the invention provides for introducing particles of aqueous sludge into a kiln at a point in the kiln effective to reduce pollutant emissions in outlet flue gasses produced by the kiln. Optimally, the sludge is introduced at a point in which maximum NOx emission rductions can occur and maximum HC1 emission reductions can occur downstream (at lower temperatures) . In a specific embodiment, introduction of about 10 to about 20 tons per hour of wet sludge results in about a 15 % to 30 % reduction in NOx emissions in a cement kiln.